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If , then find the value of .
If $\cos^{-1} x + \cos^{-1} y + \cos^{-1} z = \pi$, then find the value of $x^2 + y^2 + z^2 + 2xyz$.
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From ISC 2026 Improvement Mathematics Paper 1, question 7(ii).
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From ISC 2026 Improvement Mathematics Paper 1, question 7(ii).